The 3250 FMI 31 EPA07 fault code file is a Detroit EPA07 diagnostic sheet covering a Diesel Oxidation Catalyst (DOC) temperature rise on DD Series engines. Compiled by TruckFaultCodes.com (© 2017) from Detroit Power Service Literature, this 8-page PDF gives technicians the exact troubleshooting order for DTC 3250-31. It is a field reference, not a substitute for the full factory manuals.
Official document details
| Brand | Detroit (Detroit Diesel) |
|---|---|
| Model coverage | DD13, DD15, DD16 |
| System / group | DD Series (EPA 2007-Current) — DTCs |
| Diagnostic code | DTC 3250-31, emission level EPA07 |
| Fault name | DOC Temperature Rise |
| Pages | 8 |
| File size | 0.4 MB |
| Format | |
| Source | TruckFaultCodes.com, from Detroit Power Service Literature |
| Language | English |
3250 FMI 31 EPA07 fault summary
It provides the full eight-page EPA07 procedure, moving from harness wiggle tests through pressure-sensor checks to aftertreatment device removal and contamination analysis. Every step is laid out as a Yes/No decision branch, so you can follow the same path a Detroit dealer technician would without guessing.
- Comparing DOC inlet, outlet and DPF outlet temperatures
- Voltage service routine and MCM harness wiggle test
- DPF inlet and outlet pressure sensor voltage checks
- Removing the aftertreatment device
- Coolant, oil and fuel contamination inspection
- DOC or DPF replacement and parked regeneration
Applicable truck models and engines
This procedure applies to Detroit DD13, DD15 and DD16 engines in the DD Series (EPA 2007-Current) family. The EPA07 procedure is built around the Motor Control Module (MCM) and its 120-pin connector. For engine specifications and dealer support, see the official Detroit engine support site.
Who needs this 3250 FMI 31 EPA07 manual
Fleet technicians, mobile diesel mechanics and DD Series owners diagnosing this code with a diesel diagnostic tool such as DDDL or DDRS will find the exact step order, pin numbers and pass/fail limits they need. Keep it beside the truck during the repair.
The complete 8-page PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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